METHOD FOR STIMULATION OF WELLS BY INJECTING GAS COMPOSITIONS Russian patent published in 2017 - IPC E21B43/26 E21B43/27 C09K8/594 

FIELD: oil and gas industry.

SUBSTANCE: gas composition of three flows is formed comprising a PBT mixture, natural gas or associated petroleum gas and nitrogen which are mixed prior to injection, at that the flow control is performed for changing the mole composition of the gaseous composition components, the rate and volume of its injection from the condition providing the value of the gaseous composition temperature T₁ is less than the critical and the injection pressure P₁ is greater than the critical one. Prior to injection of gas composition, buffer nitrogen or PBT mixture is pumped through a tubing string to provide increased phase permeability of the formation is possible. In addition, as a final layer, it is possible to inject a pack of process water of high mineralisation into the well with addition of hydrate formation inhibitors in the tubing string volume. For carbonate formations in the flow of gas composition hydrochloric acid layer is additionally introduced in mixture with mutual organic solvent.

EFFECT: implementation of technologically efficient and economically viable alternative to the traditional method of hydraulic fracturing of the formation on the basis of process water.

5 cl, 2 dwg